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(No Model.) .2 sheets-sheet 1.A L. LAWTON, F. SWANN & W. R. WHITEHEAD.

MUPFLE POB. GLASS AND EARTHEN WARE. V No. 405.571. Patentedjune 18,1889.

l I l (NoModel.) K zsheets-sheet 2. L. LAWTON, P. SWANN 81; W. R.WHITEHEAD.

MUFFLE FOR GLASS AND EARTHEN' WARE.

Patented June 18, 1889.

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UNITED STATES PATENT OFFICE.

- LEVIS LAVTON, FREDRIOK SVANN, AND VILLIAM R. VVHITEHEAD, OFCHAMBERSBURG, NEV JERSEY; SAID LAW'TON ASSIGNOR TO SAID SVANN ANDVHITEHEAD.

MUFFLE FOR GLASS AND EARTHEN WARE.

SPECIFICATION forming part of Letters Patent No. 405,571, dated J une18, 1889.

Application filed February 9, 1388. Serial No. 263,549.

5 and State of New Jersey, have invented certain new and usefulImprovements in Pottery- Kilns, of which the following is aspecification.

Our invention relates to continuous muiiies Io for burning pottery,glassware, ne.; and the objects of our invention are to economize fueland regulate and locate the heat, and also to provide facilities forheating the muffle by the use of gas generated from petroleum,

I 5 naphtha, ne.

Our improved muffle is so constructed as to produce different degrees ofheat in various parts thereof, and as the ware is passed through it itis gradually heated to the dezo sired degree and afterward slowlycooled.

IVe will now proceed to describe our invention wi th reference to theaccompanying drawings, in which Figure l shows a longitudinal verticalsection of the mui'ile on the line M N on Fig. 2,

with a portion of the inner lining removed to show Inore clearly thearrangement of ilues,

and also showing in perspective sufficient of the inner construction ofthe muflie to insure Fig. 2 is a view of the mufiie in plan taken on theline 7 S of Fig. l. Fig. 3 represents a transverse vertical sectiontaken on the line l 2 of Fig. 2. Fig. a represents a transverse verticalsection of the cooling- Fig. 5 represents a transverse vertical sectionof. the entranceto the heating-chamber, taken on the line 5 G of Fig. 2g and Fig. 6 shows a transverse vertical section taken on the line 4o 910 of Fig. 2, showing the gas-generating recooling-chamber; F F F F, thedirect flues surrounding the central chamber; F F', the updraft-Iiuessurrounding the heating-chamber 5v G, downdraft-Ilue surrounding aportion of the central chamber; G' G', downdraft- (No model.)

flues surrounding a portion of the heating- 5o chamber; II,connecting-flue over the central chamber; Il', connecting-flue overheatingchamber K, lower connecting-flue to heatingchamber; K',connecting-liuc to chimney; Il, the chimney; O, the track or rails onwhich are moved the carriages bearing the Wares; P, a cold-airfluesurrounding the coolingchamber; R, a vent connecting with thecooling-chamber E; S S, doors closing the ends of the muffle; T T,valves dividing the chambers; TW, one of the carriages on which thewares are placed while being burned; and Y, a retort for the generationof gas from petroleum, naphtha, the.

The operation of the muffle is as follows: Fires are built in thenre-boxes A A. The heat from the fires passes up through the flues F F FF into the iiue II, and then descends through the flue G into the flueK, and

then up the flues F' F' to the flue H', and through that flue downthrough the nues G G' to the flue K', and thence out through the chimneyL. The heat is thus greatly economized, and is most intense in the duessurrounding the central chamber O, and it also heats to a less degreethe chamber D. The heat entering the cooling-chamber E from theheating-chamber O causes an updraft of 4cool air through. the' flues PP, the cool air being drawn in through the outer openings (shown insection in Fig. l) and passing out through the top, as shown in Fig. 4;.The wares to be burned are placed upon racks on the carriage IV, and arepassed into the chamber D through the opening at its outer end, and theouter door is closed. IVhen the wares are sufliciently heated, they arepassed on by rolling the carriage into the central chamber O, where theyremain until sufficiently heated.. They are then passed on into thecooling-chamber E, where they are cooled sufficiently to prevent injuryupon exposure to the air, and then they are passed through the outeropening of the chamber E and removed from the carriage. A series ofcarriages is used, so that the operation of heating, burning, andcooling the wares is carried on continuously as long as may be desired.

As soon as the carriages are shifted, the valves T T may be slid down,if desired, and raised again when the next shift is to made; but theiruse is not essential, though beneficial.

If the muftle is to be operated with the use of fuel gas for heating andburning the Wares, connection is made outside of the walls of the mufiieat one end of the retort Y With a pipe leading to a receiver or tankcontaining the oil or other fluid from which the gas is to begenerated., The other end of the retort is connected outside of theWalls of the muftle with a pipe or conductor leading to the fireboxes AA. Near or opposite the doors of the tire-boxes the pipe is branched, soas to admit of the gas being introduced into both boxes from the outsideof the lnnfle Having thus described our invention, What We claim as new,and desire to secure by Letters Patent, is

l. A ninfe provided With external hot-air and cold-air tluesencompassing different portions of said niuftle, whereby differentdegrees of heat may be maintained in said portions, substantially asdescribed.

2. A niufe externally heated and provided With cold-air finesencompassing a portion of it, said iiues communicating at opposite endswith the external air, substantially as described.

3. A continuous inuffle provided at one end With external cold-air finesand at the Vportion adjacent to said end with external heatlues,substantially as described.

4. A continuous muftle provided at one end with cold-air fines and atthe portion adjacent to said end with heat-hues, said heatfluesextending to the opposite end of the inufiie, substantially asdescribed.

5. A continuous inutile provided at one end with cold-air flues and atthe portion adjacent to said end with heat-fines extending as up anddown draft iiues to the opposite end ofthe niuflie and encompassing themuftle, substantially as described.

6. A mufle provided With external hot-air and cold-air finesencompassing different portions of said inutile, and a removablepartition between the cooling and heating portions of the mnfle,substantially as described.

LEWIS LAWTON. FREDRICK SVANN. l/VILLIAM R. VVHITEHEAD.

Witnesses:

MILTON R. EASTLACK, CHAs. D. WATERS.

